RTEMS | aio_fsync.c: Address Coverity dead code issue (!165)

[Joel Sherrill (@joel)]

Joel Sherrill created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/165

Project:Branches: joel/rtems:fix_aio_fsync to rtems/rtos/rtems:main
Author:   Joel Sherrill
Assignee: Joel Sherrill



## Summary

aio_fsync.c: Address Coverity dead code issue

Coverity CID 1616018

O_SYNC and O_DSYNC have the same value which led Coverity to note that
checking for both values in if's or switches leads to dead code. The
solution is to add a cpp check that they are equal and enough commentary
so if they ever are not the same, there is a hint as to why the cpp
check got tripped.

Closes #5100.


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